My home made Styrofoam cooler incubator

My first post on here, just curious how many of yall have successfully made your own incubator and use it regularly. This is the incubator i made and so far I've had good luck. This is my third hatch hoping to increase my hatch rate, i had one survivor from my first hatch last month and none from my second. Both of my first 2 hatches had 10 out of 12 eggs viable. I appreciate any input and getting to see what other incubator designs you guys have used.